<?php
/**
 * Created by PhpStorm.
 * User: Administrator
 * Date: 2017/9/18
 * Time: 15:41
 */
$arr=array(12,55,99,4556,666,111);
$max=$arr[0];
foreach ($arr as $u){
if($max<$u)
{
	$max=$u;

}

}
echo $max;


$a=3;
$b=9;

function sum($a,$b){
	return $a*$b;

}
$s=$sum;
echo $s;